Killeen police spokeswoman Carroll Smith said Monday that investigators have not determined the fire's cause.

The 19 -year-old Soulsby entered the military in June 2011 as an infantryman. He was assigned to Troop G, 2nd Squadron, 3rd Cavalry Regiment at Fort Hood since December.

The 21-year-old Sroka entered the military in February as a wheeled vehicle mechanic. He was assigned to Company B, 115th Brigade Support Battalion, 1st Brigade Combat Team, 1st Cavalry Division at Fort Hood since August. Both had received military awards.